Bio-Rad PW 41 Microplate Washer

Key Features

Consistent, Programmable Plate Washing

The Bio-Rad PW 41 is a powerful, compact and programmable 2×8-channel microplate washer designed for 96-well EIA plate washing. Precise needle positioning, integrated vacuum and dispense pumps, and liquid-level monitoring ensure consistent wash cycles — a critical factor in achieving accurate, reproducible ELISA results.

2×8-channel simultaneous washing — full 96-well plate coverage
User-adjustable dispense and aspirate head heights (0.1 mm accuracy)
Horizontal and vertical needle positioning for optimal well coverage
Integrated vacuum and dispensing pumps — no external pump required
Liquid level detectors on all wash and waste bottles
Vacuum sensing for consistent aspiration performance
Up to 75 wash programmes storable in memory
Compatible with flat, U-bottom, and V-bottom 96-well plates

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Complementary Equipment: The PW 41 is a key component of the Bio-Rad ELISA platform, working alongside the EVOLIS™ Automated EIA System, the PR 4100 Microplate Reader, and the IPS Microplate Incubator.

Applications

Where the PW 41 Is Used

Reliable plate washing is essential across all microplate-based diagnostic assays.

Infectious Disease EIA

HIV, HBsAg, HCV, Syphilis, HTLV — precise washing between incubation steps for accurate serological EIA results

Autoimmune EIA Panels

ANA, Anti-dsDNA, ENA profiling — consistent wash cycles critical for low-level autoantibody detection

Blood Donor Screening

High-throughput washing in transfusion medicine screening workflows with reproducible results across all wells

Manual ELISA Workflows

Essential wash station for laboratories running manual ELISA alongside the EVOLIS automated platform

Strip Plate Washing

Configurable for partial plate washing — ideal for small batch or on-demand testing scenarios

General Microplate Washing

Open-platform compatibility — suitable for any 96-well microplate-based assay format

Technical Specifications

PW 41 Specifications

Channel Configuration	2 × 8 channels (simultaneous)
Plate Compatibility	96-well flat, U-bottom, and V-bottom plates
Needle Positioning Accuracy	0.1 mm (vertical and horizontal)
Pump System	Integrated vacuum pump + dispensing pump
Wash Bottles	3 × 2 L wash solution bottles
Rinse Bottle	1 × 2 L
Waste Bottle	1 × 8 L
Programme Memory	Up to 75 user-defined wash programmes
Liquid Detection	Level sensors on all wash and waste bottles
Power Supply	100–240 VAC, 50/60 Hz, max 130 VA

PW 41 Microplate Washer